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Contract Assets and Contract Liabilities (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2018
Jan. 01, 2018
Contract with Customer, Asset and Liability      
Increase in contract asset due to acquisition   $ 32.5  
Increase in contract liability due to acquisition   50.7  
ASC 606      
Contract with Customer, Asset and Liability      
Contract assets $ 54.6 54.6 $ 22.1
Contract liabilities 71.8 71.8 $ 21.1
Increase in contract liability opening balance for revenue recognized $ 1.2 $ 19.0